If you send it back (again), and don't fire / modify it, you can honestly say it had been sent back while you had it, and you think it is fixed. My LGS has a policy on used / consignment - you must agree to buy it back if you did not disclose a known problem that causes issues for the next buyer.

I put any return paperwork (with id details blocked out) with anything I consign.

I don't push "buyer beware" too far. Firearms can get you into a world of hurt.